Grain drill with accurate metering of the rate of planting of seed

ABSTRACT

The present invention is an improved grain drill and a method retrofitting a previously manufactured grain drill to provide accurate weight determination of seed in a seed hopper of the grain drill. A grain drill in accordance with the invention includes a frame having a plurality of wheels for supporting the grain drill during rolling over a surface of ground to be planted with seed grain; a hopper for containing the seed grain to be planted in the ground; a support which is joined to opposed sides of the frame and to spaced apart locations of the hopper to transfer weight of the hopper to the frame, the support including at least one weight sensing device which senses a weight of seed grain in the hopper transferred through the support to the frame and provides an output of the sensed weight of the seed grain in the hopper; and a display, coupled to the output, for displaying the weight of the seed grain contained in the hopper.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. patent applicationSer. No. 10/821,858, filed Apr. 14, 2004, now U.S. Pat. No. 7,059,258,which is a continuation application of U.S. Ser. No. 08/818,717, filedMar. 14, 1997, now U.S. Pat. No. 6,732,667, the subject matter of whichapplications are incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present invention relates to grain drills used for planting grains,such as wheat and soybeans and, more particularly, to grain drillsproviding an accurate rate of metering of the planting of seed.

BACKGROUND ART

Numerous manufacturers sell grain drills which are utilized extensivelythroughout the world for planting grains, such as wheat, soybeans, oats,barley, etc. Grain drills are towed by tractors and plant wide swaths,such as 10 or more feet, with a single pass. The towing of the graindrill with a tractor provides the power for the metered planting of theseed into the furrows. Grain drills further may be either of the no tilltype, which do not require previous plowing and discing of the ground,or the till type, which require previously plowing and discing of theground.

Commercially available grain drills are highly sophisticated machineswhich provide tremendous efficiency enabling farmers to plant largetracts of land with grain. A typical soybean farmer may plant a thousandor more acres a year with a single grain drill. Thus, anything whichadversely affects the operation of a grain drill has tremendous impacton the economics of farming using grain drills.

Commercially available grain drills do not contain on-board deviceswhich permit the farmer to accurately determine the rate of planting ofseed per acre in terms of weight per acre. A grain drill has an acreagecounter which indicates approximately the number of acres which havebeen covered during planting. However, commercially available graindrills do not have on-board weighing devices which permit the weight ofseed, such as wheat, soybeans, oats, barley, etc. to be accuratelydetermined while planting is ongoing.

Seeds may be purchased in bags having a uniform weight, such as 50 lbs.,which permits the farmer to load the hopper of a grain drill with anaccurately weighed amount of seed which ultimately permits the farmer todetermine the rate of planting of seed in weight per acre by dividingthe total number of acres which have been planted during the time thatthe seed was planted by the number of preweighed bags used to fill thegrain drill seed hopper times the weight of seed per bag. The filling ofthe hopper with preweighed bags of seed is cumbersome, requires theopening of individual bags involving substantial time, and prevents thefarmer from purchasing seed in bulk. Seed purchased in bulk is cheaperwhich would result in a net savings of the cost per acre for planting ifthe farmer could accurately determine the weight of the bulk seed whichwould permit the foregoing calculation of pounds of seed per acre to bemade to enable the farmer to determine the actual rate of planting interms of weight per acre. However, the purchase of seed in bulk does notprovide the farmer with an accurate determination of the weight of seedwhich is placed in the hopper. Therefore, after the filling of a graindrill hopper with seed from a bulk source is completed, while the farmercan determine approximately the total number of acres which were plantedfrom the acre counter, there is no accurate measure of the weight of theseed which was placed in the hopper from a bulk purchase or container.

Thus, farmers today who use state of the art grain drills are faced witha constant dilemma of how to accurately determine the rate of plantingof seed in terms of weight per acre to accurately control the rate ofplanting which permits optimization of crop yield. That dilemma eitherrequires the purchase of seed in preweighed bags with its attendantinefficiencies and additional expense or makes it impossible for thefarmer to calculate the weight rate of planting of seed in an accuratemanner which results typically in not planting the grain seed at theideal weight rate per acre which is necessary to optimize yield.

Furthermore, even if the farmer knows precisely the weight of seed whichis placed in the hopper of a grain drill, there is no current mechanismfor “on the fly” determination of the rate of planting of seed in poundsper acre as the drill is operated before the seed hopper is emptied.Commercially available grain drills have a mechanical calibratedmetering device which has a linear scale having increasing numbers whichrepresent an increased rate of planting. However, because of thevariation of the size of seed which is planted and the different typesof seeds which are planted with a grain drill, the numerically graduatedscale for controlling the rate of planting provides nothing about theweight rate of seed being planted and provides information on only arelative rate of planting.

Experienced farmers develop an understanding of the desired rate ofplanting of seed in terms of weight measure per acre. If the farmeraccurately plants seed with a grain drill at the optimum rate, the yieldof the resultant crop is optimized and further, the overall cost of seedto obtain the maximum crop yield is reduced. On one hand, if less thanthe optimum quantity of seed per acre is planted, the resultant yieldwill be less than the optimum yield resulting in the farmer realizingless income per acre than would be realized if the optimum rate of seedwas planted per acre. On the other hand, if the rate of planting of seedis too great per acre, a decreased yield is realized, which is less thanthe optimum yield, resulting in the waste of seed which represents asubstantial expense to the farmer. Also, the resultant plants may bedown because of their high density, which makes it difficult for thefarmer to combine the plants at harvest. For example, if a farmer isplanting 1,000 acres of soybeans with a grain drill and makes a mistakeof overestimating the rate of planting of seeds at a rate of 5 lbs. peracre, a total of 5,000 lbs. of wasted seed occurs which represents asubstantial expense over $1,000.00 with no return on investment and apossible lessened yield because of over density in planting.

Additionally, with current state of the art grain drills, while the rateof deposition of seed may be varied by changing the setting of thecontrol of the relative rate of planting of seed, there is no way forthe farmer on the fly to determine the actual rate of planting of seedby planting only a small area. As previously described, the only way toprecisely determine the weight rate of planting seed is to accuratelycount the number of preweighed bags of seed which are placed in thehopper and after the entire hopper is planted, the total weight of seedin the hopper is computed by multiplying the number of bags used by theweight of seed per bag and that total weight is divided by the number ofplanted acres. This process is time consuming and wasteful because ifthe rate of planting of seed is set either too high or too low, all ofthe land which was planted with the seed from the full hopper is notoptimally planted at the right rate to maximize the yield and to reducethe expense of seed to the minimum amount per acre.

Additionally, while commercially available grain drills may contain asight glass for viewing if there is seed in the drill, such viewingdevices do not provide a view when the drill is close to being empty.This forces the farmer into the situation that it is possible for thehopper to be empty while the farmer is continuing to plant seed. Theresultant acreage must be reseeded or worse, may not be seeded at alluntil after the seed germinates. In any event, because of the pressuresthat are involved with weather conditions to plant seed with a graindrill at the right time, the farmer requires the ability to knowprecisely when additional seed must be added to the hopper which maynecessitate a helper to go to a seed supplier to obtain seed at the endof the day after the seed supplier is closed. If the farmer cannotaccurately determine what the weight of seed is in the hopper at alltimes, it may be impossible to determine with enough lead time thatadditional seed must be purchased from the seed supplier or otherwiseobtained from the farmer's storage of seed.

Thus, while it is highly desirable for a farmer to know the weight rateof planting of seed per acre and further the quantity of seed in thehopper of a grain drill at all times, none of the currently commerciallyavailable grain drills permit an accurate determination on the fly ofthe amount of seed present in the hopper and furthermore, do not permitthe calculation of the weight rate of planting of seed over a smallnumber of acres less than the number of acres required to empty exhaustall of the preweighed seed which has been placed in the hopper. There isa long-felt need in farming to provide a low cost and accurate devicefor determining the weight rate of planting of seed per acre and furtherthe weight of seed at all times in the hopper of a grain drill.

FIG. 1 schematically illustrates a Model 750 no till grain drill 10manufactured by the John Deere Company. The grain drill 10 is comprisedof a rigid frame 12 having a plurality of wheels 14 for supporting thedrill during rolling over a surface of ground to be planted with grainand a grain hopper 16 for containing the grain to be planted in theground. The grain drill has a no till planting mechanism 17 which iscomprised of a plurality of no till planting units 19 which extend awayfrom the grain hopper 16 to the ground as illustrated in FIGS. 1 and 3.The planting mechanism 17 receives seeds from the grain hopper 16 andconveys the seeds to the no till planting units 19 which bury the seedsbelow the ground in a known manner.

The frame 12 has a pair of longitudinally extending frame members 18which are hollow in rectangular hollow cross section and which are partof the rigid support of the grain drill. The frame 12 further has aplurality of cross frame members, not illustrated, which extend acrossthe full width of the drill to form a rectangular space frame forsupporting the weight of the seed hopper 16 across the width of thegrain drill. While FIG. 1 illustrates a single seed hopper 16, it shouldbe understood that wider grain drills have two seed hoppers bolted sideby side to the frame, as illustrated in FIG. 3, which represents a JohnDeere Model 750 grain drill, such as, for example, permitting a 20-footgrain drill to be formed from two 10-foot seed hoppers which areindividually used on 10-foot grain drills. The plurality of crossmembers are connected to the longitudinally extending frame members 18to define the overall rigid space frame structure from which theplurality of wheels 14 are suspended. Each hopper 16 is bolted to thelongitudinally extending members 18 at four corners thereof. The entireframe structure of the grain drills of FIGS. 1 and 3 is conventional andwell known.

FIG. 2 illustrates an enlarged section of the longitudinal side of thegrain drill 10 of FIG. 1. As illustrated, the outboard portion of thelongitudinally extending frame member 18 is removed by removing bolts(not illustrated) to permit access from underneath in opening 19 to thehorizontally extending member 22 as illustrated. In the Model 750 andother commercially available grain drills from John Deere, a total ofeight holes 24 are drilled through the horizontal member 22 and face thebottom horizontal surface 26 of hopper 16. Pairs of the holes 24 facethe four bottom corners of hopper 16. Eight tapped holes 28 extendthrough the bottom horizontal surface 26 and are in alignment with theholes 24 to permit the rigid attachment of the hopper 16 to the frame 12by threading fasteners 30 through the hole 24 into engagement with thethreads of a corresponding hole 28 as illustrated. The use of fasteners30 in the prealigned holes 24 and 28 permits the farmer to readilyremove the hopper if service is required or otherwise removal isnecessary and further simplifies the manufacturing process. Thefasteners 30 provide an extremely strong and rigid connection so thatthe hopper 16 does not shift relative to the frame 12 and furtherapplies the weight of the grain in the hopper to the frame 12 whenloaded and rolling across the surface of the ground during planting inthe conventional manner.

As illustrated, the opening 19 on the outboard side of the horizontallyextending frame members 18 provides access to secure the fasteners 30from underneath to the holes 24 and 28 at the manufacturing facility andthereafter to permit the farmer to have access if necessary to eithertighten the fasteners or to remove them if the hopper 16 is to beremoved from the frame 12.

The grain drill 10 contains a conventional acreage counter 32 whichprovides a running count of the number of acres planted and consists ofa rotary set of wheels similar to that of a speedometer which arecalibrated to read the actual number of acres which are planted and acontrol 34 for setting the rate of planting of seeds. The control 34 hasa series of teeth which interlock with a movable handle which is rotatedrelative to a graduated numerically calibrated scale for setting therate of planting. The rate of planting is calibrated such that highernumbers indicate a higher rate of planting but not in terms of acalibrated seed weight rate per acre. However, it should be understoodthat while the acreage counter is reasonably accurate in practice, thereis no available mechanism to calibrate the weight per acre of seedswhich are being planted purely by use of the control 34 with the onlyeffective mechanism being to distribute preweighed seeds and divide theweight by the number of acres planted as described above.

FIG. 3 illustrates a prior art grain drill 11 which is generically inaccordance with FIG. 1, except that two seed hoppers 16 are mounted sideby side. Grain drills 11 for planting wide swaths include multiplehoppers 16, such as two side by side hoppers as illustrated. The frame12 is wider than the prior art of FIG. 1 to support the increasedweight, but overall the function of the grain drill 11 is the same asthe prior art grain drill 10 of FIG. 1 and also has the samedeficiencies as described above of not providing the farmer with theability to determine the weight of seed in the hopper and the weightrate of planting of seed on the fly.

U.S. Pat. Nos. 2,449,915, 4,465,211, 4,539,921, 4,697,173, 5,595,131 and5,323,721 disclose systems used for the planting of seeds. U.S. Pat. No.4,465,211 discloses a weight indicator for a seeder but such device hasno application to grain drills because of its construction. U.S. Pat.No. 2,449,915 discloses an indicator for indicating the level of seed ina seed hopper but does not disclose any weighing mechanism. U.S. Pat.No. 4,539,921 discloses a modular drill frame construction. U.S. Pat.No. 4,697,173 discloses a monitoring apparatus which monitors variousparameters of agricultural seeding, including the level of seeds storedin a hopper of a seeder and a sensor for providing a measure of the rateof movement of the seeder over the ground. U.S. Pat. No. 5,959,131discloses a flexible and resilient support for a grain box of a graindrill. U.S. Pat. No. 5,323,721 discloses a planter monitoring systemwhich determines a number of parameters of planting. None of theaforementioned patents discloses a mechanism which may be used toaccurately weigh the seed within a hopper of a grain drill and toprovide the farmer with an accurate measure of the weight rate of seedsbeing planted.

DISCLOSURE OF THE INVENTION

The present invention is an improved grain drill which senses the weightof seed grain in a hopper which contains the seed to be planted andfurther, a method for modifying a grain drill having a frame including aplurality of wheels for supporting the grain drill during rolling over asurface of ground to be planted with grain and a hopper joined to theframe for containing the seed grain to be planted to sense the weight ofseed grain in the hopper. In accordance with the invention, a support isjoined to opposed sides of the frame and to spaced apart locations ofthe hopper to transfer weight of the hopper to the frame and includes atleast one weight sensing device which senses the weight of seed grain inthe hopper transferred through the support to the frame. The at leastone weight sensing device provides an output of the sensed weight of theseed grain in the hopper which is coupled to a display for displayingthe weight of the seed grain contained in the hopper so as to providethe operator of a tractor towing the grain drill with an accurateindication of the weight of seed grain contained in the hopper at alltimes.

The present invention provides substantial advantages to operators ofgrain drills in comparison to the prior art described above. Byproviding the operator of a grain drill with an accurate weight of theseed in the hopper at all times, including during planting operations,several operational advantages are realized. First, the control forsetting the rate of planting may be readily accurately calibrated fordiverse types and different sizes of seed grains in terms of weight peracre being planted after the planting of a few acres to fine tune therate of planting to a desired weight rate of grain seed per acre. Thecalibration is simply achieved by the operator determining the weight ofthe seed grain, which is planted over a small number of acres which areindicated to have been planted by the acreage counter, to calculate theweight rate of seed grain planted per acre by simply dividing the totalweight of seed grain planted by the number of acres planted. If theinitial setting of the control controlling the rate of planting in theprior art is either too high or too low, the control is then moved inthe opposite sense to adjust the rate of planting of seed grain to thedesired planting rate of weight per acre which the farmer wishes toachieve during planting. The precise calibration of the rate of plantingof seed grain in terms of weight per acre can be achieved after aninitial calibration and possibly one more calibrations after resettingof the control controlling the relative rate of planting to achieve thedesired rate of planting in terms of weight per acre which provides thefarmer with a substantial cost savings because, as explained above,planting seed grain at the optimum rate provides the greatest crop yieldat the smallest possible seed grain cost per acre thereby maximizing thefarmer's economic yield per acre. Additionally, the invention byproviding the farmer with a continuous display of the weight of seedgrain in the seed grain hopper, enables the farmer to make arrangementsfor the acquiring of additional seed grain to refill the hopper prior torunning out of seed grain which, in the prior art, often resulted in asubstantial loss of time to the farmer because the farmer was requiredto determine how much area was not planted because the hopper had runout of seed grain. Furthermore, the continuous display of the weight ofseed grain in the hopper permits the farmer to exhaust one type of seedgrain in the hopper and change over to another type of seed grainwithout substantial mixing of the two seed grain types. It is highlydesirable for farmers to use different types of seed grains for plantinga crop to provide a hedge against a bad yield for one seed grain type byproviding another seed grain type during the same planting which willprovide a higher yield in different weather conditions which would notproduce a high yield for the first seed grain type. Finally, asexplained above, the farmer may purchase seed grain in bulk quantitieswhich is cheaper than buying it in preweighed bags to thereby lessen thecost of seed grain per acre in planting and lessen the time and effortrequired to load the hopper of the grain drill by permitting use ofpowered conveyers or other types of seed grain transporting deviceswhich supply seed grain from bulk containers which eliminates the handlabor and low efficiency of opening individual seed grain bags.

When the present invention is used to retrofit an existing grain drill,such as a drill from the John Deere Company, as illustrated in the priorart of FIGS. 1-3, only minor modifications are required to the existingunit because the fitting of a support, which transfers weight of theseed grain in the hopper to the frame, is retrofitted to use the sameholes which are used to attach the frame to the hopper with fasteners asdescribed above at the time of manufacturing or, alternatively, requiressimple additional attachments of the support to the hopper and theframe.

The purchase cost of the present invention from a farm equipmentsupplier may be recovered by a farmer in a single year by permitting thefarmer to accurately calibrate the weight of planting of seed grainwhich saves wasted seed grain and lowered yield from over planting andreduced yield from under planting.

Furthermore, while a preferred embodiment of the present inventionlocates the support for transferring the weight from the hopper througha weight sensing device in the support directly underneath the hopperand within the longitudinally extending frame members on both sides ofthe drill, it should be understood that the present invention may bealternatively practiced with a support transferring the weight from thehopper outboard of the longitudinally extending frame members through aweight sensing device to the frame at a point of attachment on anoutside surface of the longitudinally extending frame member so as topermit any design of grain drill, including those without any accessibleopening underneath the frame 12, as described in conjunction with theprior art of FIG. 2, to be utilized with the practice of the presentinvention.

The present invention utilizes weight sensing devices which preferablyare commercially purchased load cells which are configured into thesupport to transfer the weight of the hopper to the frame for producingan output signal which is displayed from a commercially availabledisplay unit which decodes the individual weights sensed by each loadcell and converts the individual weights sensed by each load cell into acumulative total weight display of the seed grain contents of thehopper. Each of outputs from the individual weight sensing deviceslocated in the support are electrically connected to the display withindividual electrical cables which provides the aforementioned displayof the total weight sensed by each of the weight sensing devices.Preferably, at least four weight sensing devices are utilized with thepresent invention. In applications of the invention where two or morehoppers are used in a side by side configuration, such as FIG. 3, an oddnumber of weight sensors may be used per hopper when a common supportfor two frames being utilized inboard of the sides of the grain drill.

The present invention is a grain drill comprising a frame having aplurality of wheels for supporting the grain drill during rolling over asurface of ground to be planted with grain; a hopper for containing thegrain to be planted in the ground; a support which is joined to opposedsides of the frame and to spaced apart locations of the hopper totransfer weight of the hopper to the frame, the support including atleast one weight sensing device which senses a weight of seed grain inthe hopper transferred through the support to the frame and provides anoutput of the sensed weight of the seed grain in the hopper; and adisplay, coupled to the output, for displaying the weight of seed graincontained in the hopper. The support comprises a pair of weight bearingsupports which are respectively joined to opposed sides of the frame,each weight bearing support including first and second vertical partswhich are respectively attached to the hopper at the spaced apartlocations separated along a longitudinal dimension of the grain drilland a horizontal part joined to the vertical parts and attached to theframe. The at least one weight sensing device comprises first and secondload cells associated with each of the pair of weight bearing supports,the first load cell being loaded with weight transferred from the firstvertical part to the horizontal part and the second load cell beingloaded with weight transferred from the second vertical part to thehorizontal part. A first end of the first and second vertical parts isattached to the hopper and a second end of the first and second verticalparts is respectively attached to spaced apart positions of thehorizontal part to transfer the weight of the seed grain in the hopperto the horizontal part; and the horizontal part has first and secondhorizontal extensions, the first horizontal extension having a first endwhich is coupled to the frame and includes the first load cell and thesecond end which is deflected downward by the weight of the seed grainin the hopper and which is attached to the second end of the firstvertical part and the second horizontal extension having a first endwhich is attached to the frame and includes the second load cell and thesecond end which is deflected downward by the weight of the seed grainin the hopper and which is attached to the second end of the secondvertical part. The support frame includes at each of the opposed sides ahorizontal member, each horizontal member having at least first andsecond spaced apart holes extending vertically through the horizontalmember and which respectively receive and allow vertical movement of aportion of the first and second vertical parts, the holes restrictinghorizontal movement of a hopper relative to the frame by confining theportion of the first and second vertical parts to within the holes. Thefirst and second vertical parts comprise a horizontal piece attached toone end of a vertical piece and another end of the vertical piece beingthe second end of the vertical part, at least one connector extendingfrom the horizontal piece through one of the holes and being verticallymoveable therein and into engagement with the hopper. At least a pair ofconnectors extend from the horizontal piece at opposed ends thereofspaced from a point of attachment of the vertical piece to thehorizontal piece. Each connector is threaded and engages threads in thehopper at one of the spaced apart positions of the hopper. A bushing islocated in each hole and securely engages each connector to preventhorizontal movement of the connector relative to the bushing. The spacedapart positions are located at four corners of the hopper and thesupport is attached to the four corners by engagement with a bottom partof the hopper.

Each weight bearing support does not to extend beyond a width of aportion of the frame to which the weight bearing support is attached or,alternatively, at least one of the weight bearing supports is mounted atleast in part extending beyond a width of a portion of the frame towhich the weight bearing support is attached.

A method for modifying a grain drill having a frame having a pluralityof wheels for supporting the grain drill during rolling over a surfaceof ground to be planted with seed grain and a hopper joined to the framefor containing the seed grain to be planted comprises raising the hopperupward from the frame to separate the hopper from being joined to theframe; positioning a support between the hopper and the frame to jointhe support to opposed sides of the support and to spaced apartlocations of the hopper to support the hopper in a raised position abovethe frame, the positioned support transferring weight of the hopper tothe frame, including at least one weight sensing device which senses aweight of the seed grain in the hopper transferred through the supportto the frame and which provides an output of the sensed weight of theseed grain in the hopper; and providing a display for displaying on thegrain drill the weight of the seed grain contained in the hopper. Theconstruction of the support utilized with the foregoing method ispreferably as described above.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective schematic view of a prior art grain drill.

FIG. 2 is an enlarged view of a portion of the prior art grain drill ofFIG. 1 showing the joining of the seed hopper directly to the frame withthreaded fasteners.

FIG. 3 is a prior art view of a grain drill having multiple side by sideseed hoppers.

FIG. 4 is a side elevational view of a first embodiment of a grain drillincluding a support in accordance with the invention for transferringweight from the seed hopper to the frame which may be used to modify theprior art grain drill of FIGS. 1 and 2 to display a weight of seed grainin the hopper.

FIG. 5 is a sectional view of FIG. 4 taken along section line 5-5 ofFIG. 4.

FIG. 6 is a sectional view of FIG. 4 taken along section line 6-6 ofFIG. 4.

FIG. 7 is a sectional view identical to FIG. 6 illustrating the effectof weight loading from the hopper on the support.

FIG. 8 is a top plan view of a grain drill including the support of theinvention in accordance with FIGS. 4-7.

FIGS. 9-11 illustrate a second embodiment of a grain drill including asupport in accordance with the present invention which has the supportextending outside the vertical side wall of the longitudinal framemembers and the outboard sides of the grain drill.

FIGS. 12-14 illustrate a third embodiment of a grain drill in accordancewith the invention having side by side grain hoppers such as the priorart of FIG. 3 including a support having inboard weight bearing supportslocated at opposed corners of side by side hoppers.

FIG. 15 is an exploded diagram of a commercial embodiment of the presentinvention which may be retrofitted to a Model 750 grain drill from theJohn Deere Company which is very similar to the first embodiment of thesupport of FIGS. 4-8.

Like reference numerals identify like parts throughout the drawings.

BEST MODE FOR CARRYING OUT THE INVENTION

FIGS. 4-8 illustrate a preferred embodiment 50 of a grain drill inaccordance with the present invention which is a modification of theprior art of FIGS. 1-3 described above. The prior art has been modifiedto provide a support 52 which is joined to a first opposed side 54 and asecond opposed side 56, as illustrated in FIG. 8, of the frame 12 and tospaced apart locations 58 of the hopper 16 which are preferably at thefour corners of the bottom surface 26 thereof to transfer weight of thehopper and seed grain therein to the frame. The support 52 includes atleast one weight sensing device 60 which each preferably is acommercially purchased load cell of the one inch weigh bar type having acalibration diameter of 2-⅛″ manufactured by the Weight Tronix Companyof Fairmont, Minn. The weight sensing devices 60 function to generate anaccurate output of sensed weight which is a function of verticallydownward deflection 70 caused by the application of the weight of theseed grain 71

in the hopper 16 thereto as described below. Each of the weight sensingdevices 60 has an output cable 62 which is connected to a display 64.The display 64 is preferably Part Number 12980 also manufactured byWeight Tronix Company, which is designed to total the sensed outputweights from each of the weight sensing devices 60 and generate adisplay 66 of the total weight of seed grain 71 in the hopper 16 toenable the farmer to visually determine from a tractor towing the graindrill 50 the weight of seed grain in the hopper at all times. It shouldbe understood that the invention is not limited to the particular choiceof weight sensing devices 60 in the form of load cells and the display64.

In a preferred form of the present invention, the support 52 iscomprised of a pair of weight bearing supports 68 which fit into thehollow space 19 underneath the horizontal member 22 of thelongitudinally extending frame members 18 as described above in FIG. 2.As illustrated in FIG. 8, the individual weight bearing supports 68,which comprise the support 52, are located at opposed sides of the graindrill and are separated by the width thereof. As a result of the weightbearing supports 68 fitting below the horizontal member 22 within thehollow rectangular cross section of space 19 of the longitudinallyextending frame members 18, the weight of the hopper 16 is transferreddirectly downward through the holes 24 through each weight bearingsupport 68 to the frame 12 as described in more detail below. Thetransfer of the weight from the hopper 16 directly downward to theweight bearing supports 68 causes a vertically downward deflection 70 ofthe individual weight sensing devices 60 proportional to the sensedweight which produces the aforementioned output of the weight 66 of seedgrain 71 in the hopper 16 on display 64.

Each weight bearing support 68 includes first and second vertical parts72 and 74 which are respectively attached to the hopper 16 at the spacedapart locations 58 of the bottom surface 26 of the hopper which arepreferably at the four corners of the hopper and mounted in a lineparallel to a longitudinal dimension of the longitudinally extendingframe members 18 of the grain drill and a horizontal part 76 joined tothe vertical parts and attached to the frame 12. As illustrated, eachweight bearing support 68 includes first and second weight sensingdevices 60. The first weight sensing device 60 of the weight bearingsupport 68 is loaded with weight transferred from the first verticalpart 72 to the horizontal part 76 and the second weight sensing deviceis loaded with weight transferred from the second vertical part 74 tothe horizontal part 76. A first end 78 of the first and second verticalparts 72 and 74 is attached to the hopper 16 and a second end 80 of thefirst and second vertical parts is respectively attached to spaced apartlocations of the horizontal part 76 to transfer the weight of the seedgrain 71 in the hopper to the horizontal part to load the weight sensingdevices 60 therein. The horizontal part 76 has a first horizontalextension 82 and a second horizontal extension 84. The first horizontalextension 82 has a first end 86 which is coupled to the frame 12 andincludes the first load sensing device 60 and a second end 88 which isdeflected downward as indicated by arrow 70 by the weight of the seedgrain 71 in the hopper 16 and which is attached to the second end 80 ofthe first vertical part 72 and the second horizontal extension 84 has afirst end 90 which is coupled to the frame 12 and includes the secondweight sensing device 60 and a second end 92 which is deflected downwardby the weight of the seed grain in the hopper as also indicated by arrow70 and which is attached to the second end 80 of the second verticalpart 74.

As described above, the frame 12 includes at each of the opposed sidesof the longitudinally extending frame member 18, a horizontal member 22.Each horizontal member 22 has at least first and second spaced apartholes 24 extending vertically through the horizontal member and whichrespectively slidably receive a portion of the first and second verticalparts 72 and 74. The holes 24 restrict horizontal movement of the hopper16 relative to the frame 12 by confining the portion of the first andsecond vertical parts 72 and 74 to within the holes.

Each of the first and second vertical parts 72 and 74 have multipleparts. A horizontal piece 96 is attached to one end 98 of a verticalpiece 100. The other end of the vertical piece 100 is the second end 80of the first and second vertical parts 72 and 74 which respectively areattached to the ends of first and second horizontal extensions 82 and84. A pair of threaded connectors 102 project upward from the horizontalpiece 96 through the holes 24 and into threaded engagement with thethreads within holes 28 of the bottom 26 of the hopper 16. A nut 101, asillustrated in FIGS. 6 and 7, may be placed onto a portion of thethreads of the connectors 102 which project upward beyond a bottomsurface of the bottom 26. Furthermore, the invention is not limited toany type or number of connectors but threaded connectors are preferredbecause they may be chosen to have threads which engage the threads inthe bottom 26 of the hopper 16 which are used by the manufacturer toattach the hopper to the frame 12. The use of the aligned holes 24 and28 and threaded connectors 102 to engage the threads in the holes 28 inthe bottom of the hopper 16, which are used by the manufacturer,facilitates the retrofitting of support 52 to an existing grain drill inaccordance with the prior art of FIGS. 1-3.

The aforementioned portion of the first and second vertical parts 72 and74 which engages the hopper 16 should have at least one connector 102extending from the horizontal piece 96 and through one of the pair ofholes 24 and 28 and into engagement with tapped threads in the bottomhorizontal surface 26 of the hopper 16. Preferably, as illustrated, apair of connectors 102 extend from each horizontal piece 96 to engage adifferent one of the four corners 58 of the hopper 16 to provide a fourpoint suspension of the hopper which provides both high rigidity andeven weight transfer of the seed grain 71 in the hopper 16 to the weightsensing devices 60 within the weight bearing supports 68. Bushing 104fits slidable within an enlargement of the hole 24 of the prior art ofFIGS. 1-3 within horizontal member 22 and receives the threadedconnectors 102 which transfer the weight of the seed grain 71 from thehopper 16 down through the load sensing devices 60 to the frame 12.

Each connector 102 preferably is attached to respective ends of thehorizontal piece 96 by drilling holes in the respective ends and using anut 105 and washer 106 to secure the connector into engagement with thehole. Furthermore, a block 108 is attached to the spaced apart locations58 of the hopper 16 with threaded connectors 110. The block 108 has ahole 112 drilled therein to tightly receive the bushing 104 to reinforcethe sliding engagement of the support 52 relative to the horizontalmember 22.

Additionally, each weight bearing support 68 has a pair of spaced apartsupport feet 114 which extend vertically downward from a horizontal rod116 to which the individual weight sensing devices 60 are attached. Alsoattached to horizontal rod 116 is a bracket 118 which is secured to theframe 12 by a threaded fastener 120. The feet 114 transfer the weight ofthe hopper 16 loaded directly onto the weight sensing devices 60 as aconsequence of being located relatively close to the ends 86 of theattachment of the weight sensing devices 60 to the outboard ends 122 ofthe horizontal rod 116.

The foregoing grain drill may be retrofitted to an existing grain drillsuch as, but not limited to, the prior drills of FIGS. 1-3 by raisingthe hopper(s) 16 from the illustrated portions of FIGS. 1-3 to separatethe hopper from being joined to the frame 12. Thereafter, theaforementioned support 52, as described above, is positioned between thehopper 16 and the frame 12 as described above in FIGS. 4-7 to join thesupport to the opposed sides 54 and 56 of the frame and to spaced apartlocations 58 of the hopper to support the hopper in a raised positionabove the frame as illustrated in FIGS. 4-7. The display 64 is attachedto the frame 12 by welding a support bracket to the frame or attachingthe support bracket to the frame with threaded connectors at a positionpermitting an operator to view a numerical display of the weight 66 fromthe tractor pulling the grain drill. The positioned support 52 transfersthe weight of the hopper 16 to the frame 12 in the manner as describedabove. Thus, the present invention is applicable to both newconstruction of grain drills or to retrofitting existing grain drillswithout extensive modification of the manufacturing process or extensivelabor for the retrofitting process as a consequence of the support 52being positionable in the previously drilled holes 24 in the horizontalmember 22 of the longitudinally extending members 18 and the previouslydrilled holes 28 of the bottom 26 of the hopper.

While the invention in a preferred embodiment mounts the support 52directly below the horizontal member 22 within the opening 19 of thelongitudinally extending frame members 18, in grain drills which do nothave access from below the upward most part of the frame 12 facing thehopper 16, the load of the hopper may be transferred outboard of theoutside face of the frame 12 of the grain drill with a support 130 asillustrated in a second embodiment of a grain drill in FIGS. 9-11 inaccordance with the present invention. Alternatively, the load of thehopper 16 may be transferred at least in part inboard of the outsidelongitudinal frame members 18 to an inside face of the frame 12 of thegrain drill with a support 170 as illustrated in a third embodiment inFIGS. 12-14.

FIGS. 9-11 illustrate a second embodiment of a support 130 in accordancewith the present invention which differs from the first embodiment 52 inthat the support does not fit directly vertically below the hopper 16 inthe space 19 as illustrated in FIG. 4. Certain reference numerals whichare common to FIG. 4 have been omitted. Instead, the support 130 has aplurality of angle brackets 132, 136, 140 and 144 which directly bolt toa vertical outside side faces of the hopper 16 and the longitudinalframe members 18 as illustrated. The first angle bracket 132 bolts tothe vertical sidewall of the hopper 16 with a connector 134 and thesecond angle bracket 136 bolts to the vertical sidewall of thelongitudinal frame member 18 with connector 138. The angle bracket 140bolts to the vertical sidewall of the longitudinal member 18 withconnector 142 and the angle bracket 144 also bolts to the verticalsidewall of the longitudinal member 18 with connector 146. Asillustrated, this embodiment transfers the weight of the seed in thehopper 16 from the hopper through the support 130 through the at leastone load sensing device 60 to the longitudinal frame member 18 via theforegoing angle brackets 132, 136, 140 and 144. This embodimentpreferably has four weight sensing devices deployed in the same manneras the first embodiment. This design may be used to retrofit graindrills or for a new construction of grain drills where there is noopening 19 directly below the hopper 16 as in the embodiment of FIGS.4-8.

The third embodiment of a grain drill of the present invention includesa support 170 which differs from the first two embodiments in providingthe total weight of grain within tandem hoppers 16 as illustrated inFIGS. 12-14. Certain reference numerals which are common to FIG. 4 havebeen omitted. A plurality of weight bearing supports are utilized in thethird embodiment 170. The weight bearing supports 68 are located on theoutboard sides as illustrated and may be identical to the first andsecond embodiments as described above. On the inboard sides of thetandem hopper 16, a pair of weight bearing supports 170 are locateddiagonally at the respective front and rear corners of the inboard sidesof the individual hoppers 16 as illustrated in FIG. 12. A pair of plates172, as illustrated in FIG. 13, are disposed at the diagonal corners ofthe tandem hoppers 16 to provide a support at the front and rear of thehoppers.

Each plate 172 is bolted to the individual tandem hoppers 16 withfasteners 174. Individual weight sensing devices 60 are located at eachof the weight bearing supports 170 which provide a two point support forthe inboard sides of the tandem hoppers 16 at the diagonal corners 190that transfers the weight of the seed in the hoppers to the longitudinalframe members 18. Individual fasteners 176 attach a member 188 to theplate 172 which is attached to the corner 190 of the side by sidehoppers with fasteners 174. The member 188 is also bolted to thelongitudinal frame member 18 with fasteners 192. An angle bracket 194attaches the inboard end of horizontal rod 116 to the horizontal member18. The outboard end 122 of the horizontal rod 116 is attached to theweight sensing member 60. The overall function of the third embodimentof the weight bearing supports 170 is similar to that of the first andsecond embodiments. The distinction is that the weight of the seed inthe tandem hoppers 16 on the inboard side is transferred through theweight bearing supports to the side of the longitudinal frame members 18through the use of plates 172 which provide support for the overallweight of the hoppers through the weight bearing supports including theat least one weight sensing device 60 instead of resting directly on theframe as in the prior art of FIG. 3.

FIG. 15 illustrates an exploded view of the present invention which iscommercially sold for retrofitting to a Model 750 John Deere GrainDrill. Its construction is similar to the first embodiment 50 with theprincipal difference being its illustration in exploded form.

The present invention, as explained above in the various embodiments,may be configured in different geometrical constructions to provide asupport which transfers the weight of seed grain 71 from the hopper 16to the frame 12 of grain drills of diverse designs to permit accuratesensing of the weight of the seed grain with the advantages as describedabove.

The overall process of utilizing the present invention to optimize therate of planting of seed grain with the grain drill is as follows.Initially, the farmer sets the control 34 to an estimated rate ofplanting of seed grain which the farmer believes to be as close aspossible to the desired weight rate of planting per acre. After plantingone or more acres, the total acreage planted is determined from readingthe count of the acreage counter 32 and is divided into the number ofpounds of seed grain planted, as indicated by the decrease in weight ofseed grain in the hopper 16 by the display 64, to determine the actualweight of seed grain planted per acre. After the calculation of theactual weight of planting of seed grain per acre, the control 34 isadjusted upward or downward to move the rate of planting from the actualrate of planting, assuming it is different from the desired rate ofplanting, toward the desired rate of planting. This process may gothrough one or more iterations until a highly accurate rate of plantingis achieved.

While the present invention has been described in terms of its preferredembodiment, it is intended that numerous modifications may be madethereto without departing from the spirit and scope of the invention. Itis intended that all such modifications fall within the scope of theappended claims.

1. A seed planter comprising: a frame having a plurality of wheels forsupporting the planter during rolling over a surface of ground to beplanted with seed; a container for containing seed to be planted in theground; a support which is joined to opposed sides of the frame and tospaced apart locations of the container to transfer weight of thecontainer and any seed therein to the frame, the support including atleast one weight sensing device which senses a weight of the containerand any seed therein transferred through the support to the frame andprovides an output of the sensed weight; a planting mechanism whichreceives seeds contained in the container and plants the seeds receivedfrom the container below the ground; and a display, coupled to theoutput, for displaying the weight of the seed contained in thecontainer; and wherein the at least one weight sensing device comprisesat least one load cell associated with the support.
 2. A method formodifying a seed planter including a frame having a plurality of wheelsfor supporting the seed planter during rolling over a surface of groundto be planted with seed, a container joined to the frame for containingseed to be planted, and a planting mechanism which plants seeds receivedfrom the container below the ground comprising: raising the containerupward from the frame to separate the container from being joined to theframe; positioning a support between the container and the frame to jointhe support to opposed sides of the frame and to spaced apart positionsof the container to support the container in a raised position above theframe, the positioned support transferring weight of the container andany seed therein to the frame and including at least one weight sensingdevice which senses a weight of the container and any seed thereintransferred through the support to the frame and which provides anoutput of the sensed weight of the container and any seed therein;providing a display on the planter for displaying the weight of the seedcontained in the container; the planting mechanism receiving seedscontained in the container and planting the seeds received from thecontainer below the ground; and wherein the at least one weight sensingdevice comprises at least one load cell associated with the support. 3.A scale for use with a seed planter including a frame mounted on groundengaging wheels, a seed container for containing seed and beingsupported on the frame, a planting mechanism which plants the seedscontained in the container below the ground, the scale comprising atleast one load cell that suspends the seed container from the frame, theat least one load cell being mounted so that an entire weight of theseed container and any seed therein is supported on the frame throughthe at least one load cell; and a readout device operatively connectedto the at least one load cell so that the weight of the seed containerand any seed therein causes deflections of the at least one load cellwhich are translated into measurable weight of the seed in the containerdisplayed on the readout device.
 4. A scale for use with a seed planterhaving a frame mounted on ground engaging wheels, a seed container forcontaining seed and being supported on the frame, a planting mechanismwhich plants the seeds contained in the container below the ground, thescale comprising at least one load cell that suspends the seed containerfrom the frame so that an entire weight of the seed container and anyseed therein is supported on the frame through the at least one loadcell, and a readout device operatively connected to the at least oneload cell so that the weight of the seed container and any seed thereincauses deflections of the at least one load cell which are translatedinto measurable weight of the seed in the container displayed on thereadout device.